(AllHipHop News) While Wiz Khalifa and Lil Wayne have rarely recorded together, the two are share a mutual admiration for that special green smoke.

After just a few collaborations in their career (Game – “Celebration”), the two superstar rappers will co-headline Denver’s Annual 420 Rally.

Hosted at Denver’s Civic Center Park on April 16th, The Denver Annual 420 Rally is one of the largest cultural and political events dedicated to marijuana’s legalization and decriminalization.

Over the years, The Denver Annual 420 Rally has become a non-profit organization dedicated towards building an inclusive, engaged community that promotes equality in economic justice, access to fair housing, improved education, and greater police accountability and professionalism.

The event is being presented by the Colorado Marijuana Company, Sweet Leaf, and MassRoots, one of the largest technology platforms for cannabis consumers with more than 775,000 users.

“We could not be more excited to welcome Lil Wayne and Wiz Khalifa, two of the most accomplished artists in the country, to our celebration of the culture and legalization of cannabis,” stated President of the 420 Rally Non-Profit Organization Miguel Lopez.

Last year the rally surpassed 125,000 people in attendance and raised awareness for some of the most pressing political issues facing Colorado and the U.S.

“This event would not have been possible without our licensed cannabis partners, Sweet Leaf and Colorado Marijuana Company. We cannot be more excited for these next few weeks,” Lopez added.

To register for free tickets and MassRoots All Access Passes, please visit 420Rally.com or any of the 6 Denver Sweat Leaf locations.